1910-1919

At the site of the first water pumping station providing water and sewage systems to the City of Erie in 1868, the Chestnut Street Pumping Station houses one of the largest steam engines, which pumped 20 million gallons a day. The triple-expansion steam reciprocating engine, which pumped water from the filter plant to the city reservoir, was typical of those used in municipal water pumping stations throughout the country during the late nineteenth and early twentieth centuries.

In its infancy, Hangar Nine housed Curtiss JN-4s ("Jennys") like the one Charles Lindbergh landed there when he reported for duty as a flying cadet in 1924.

As the U.S. was preparing to enter World War I, the Army raced to build an entire airfield, complete with 16 wooden hangars, successfully completing it in less than a year. The last remaining World War I facility of its kind, Hangar Nine at Brooks Air Force Base represents the emergence of fast-track construction methods using available materials and the skills of a local workforce.

By the 1890s, the transportation infrastructure of downtown Boston - a maze of narrow, winding streets laid out, in some cases, along Colonial cow paths - proved completely inadequate for the needs of a modern, bustling metropolis. Tremont Street, the city's main thoroughfare, was regularly subject to gridlock from a convergence of foot traffic, horse-drawn conveyances, trolley lines, and electric streetcars. To rectify the problem, the Boston Transit Commission, with Howard A. Carson as chief engineer, was created in 1894 to study remedies. 

The St. Petersburg Yacht Basin was the original operating location of the St. Petersburg – Tampa Airboat Line, the nation’s first, regularly-scheduled commercial airline. The line’s inaugural flight was on January 1, 1914, with two daily, round-trip flights between St. Petersburg, Fla., and Tampa, Fla., using two Benoist Type XIV airboats. The flights were twenty-two minutes in length, one way, and rarely exceeded an altitude of five feet above the waters of Tampa Bay.

Belle Fourche, meaning "Beautiful Forks" in French, refers to the confluence of the Redwater and Belle Fourche Rivers. The gold rush to the Black Hills in 1876 brought many people to the area, but agriculture and livestock soon became the principal industries. Farmers and civic leaders recognized the need for a reliable source of irrigation water in this semi-arid region and petitioned the Federal government for funds to build an irrigation and flood control system.

Work began in 1887 on the high-level truss "Winner Bridge" crossing the Missouri River at Kansas City. The piers were completed in 1890, but for financial reasons the project was suspended. John Alexander Low Waddell, renowned civil engineer, prepared an alternate design for a lift bridge in 1895, which would ultimately be built as the Armour-Swift-Burlington Bridge.

Spearheaded by Hugh Cooper, the Keokuk Dam & Power Plant served as a prototype for many future power plants. The project harnessed the hydropower of the Mississippi River, between Keokuk, Iowa and Hamilton, Illinois.

The crest of the dam is nearly a mile long. The dam structure features 119 arch spans between six-foot-thick piers and a 110-foot-wide pneumatic lock. Combined with the lock, the dam reduced travel time for steamboats by nearly two hours.